Remove unused "Disable remote Alt-Svc" QUIC experiment code.

net/quic/chromium/quic_network_transaction_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <memory>
 #include <ostream>
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 2997 matching lines @@
                                                    false, true, 0, "hello!"));
   mock_quic_data.AddWrite(ConstructClientAckPacket(3, 2, 1));
   mock_quic_data.AddRead(ASYNC, ERR_IO_PENDING);  // No more data to read
   mock_quic_data.AddRead(ASYNC, 0);               // EOF
 
   mock_quic_data.AddSocketDataToFactory(&socket_factory_);
 
   // There is no need to set up main job, because no attempt will be made to
   // speak to the proxy over TCP.
   request_.url = GURL("http://mail.example.org/");
-  params_.enable_quic_alternative_service_with_different_host = false;
   TestProxyDelegate test_proxy_delegate;
   const HostPortPair host_port_pair("mail.example.org", 443);
 
   test_proxy_delegate.set_alternative_proxy_server(
       ProxyServer::FromPacString("QUIC mail.example.org:443"));
   params_.proxy_delegate = &test_proxy_delegate;
   CreateSession();
   EXPECT_TRUE(test_proxy_delegate.alternative_proxy_server().is_quic());
 
   // The main job needs to hang in order to guarantee that the alternative
@@ skipping 1666 matching lines @@
 
   request_.url = GURL("https://mail.example.org/pushed.jpg");
   ChunkedUploadDataStream upload_data(0);
   upload_data.AppendData("1", 1, true);
   request_.upload_data_stream = &upload_data;
   SendRequestAndExpectQuicResponse("and hello!");
 }
 
 }  // namespace test
 }  // namespace net